<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0,user-scalable=no
    " />
    <script src="./rem.js"></script>
    <title>移动端适配问题</title>
    <style>
        div {
            font-size: 0.8rem;
        }
    </style>

<body>

    <body>
        <div>123</div>
    </body>
</body>

</html>